I was worried about consistency there, but I guess Owen only bothers with time paradox when he can get something out of it, he didn't seem too concerned about it in this one.
I think my favorite use of Time Paradox (or at least shouting it over and over) that I can remember off-hand is in the extra videos included in Metal Gear Solid 3 Subsistence. http://www.youtube.com/watch?v=jPgDIWxgOYA Spoiler heavy. xD
The 'Time Splitters' series was pretty !@#$ing cool. Except I don't really remember the storyline altogether that well, it made a much better game than a story. I'm pretty sure it had something to do with time paradoxes though.
Oh yeah, and so does Half-Life, although not directly.